Sinker for warp knitting machine

ABSTRACT

A sinker for use in warp knitting machines. The lower portion of the sinker throat has a protruberence formed therein which functions as a knock-over step. The throat is extended beyond this step by a slot. The old stitches may slide off into this slot after knock-over, to reduce wear and stress on the threads.

United States Patent n91 Kohl [ SINKER FOR WARP KNITTING MACHINE [76] Inventor: Karl Kohl, l0 Chlorodont Strasse,

Obertshausen, Germany [22] Filed: Dec. 12, 1972 [21] Appl. No.: 314,298

[30] Foreign Application Priority Data Dec. 16, 1971 Germany 2162544 [52] U.S. Cl. 66/109 [51] Int. CL. D04b 15/06, D04b 15/24, DO4b 27/04 [58] Field of Search 66/109, 110, 104, 86, 9O

[56] References Cited UNITED STATES PATENTS Nebel 66/95 451 Mar. 26, 1974 Primary Examiner-Ronald Feldbaum Attorney, Agent, or Firm-Omri M. Behr 57 2 ABSTRACT A sinker for use in warp knitting machines. The lower portion of the sinker throat has a protruberence formed therein which functions as a knock-over step. The throat is extended beyond this step by a slot. The

old stitches may slide off into this-slot after knockover, to reduce wear and stress on the threads.

4 Claims, 2 Drawing Figures shes-L928 PATENIEUnaazs ram SHEEI 2 OF 9 PATENYEB M825 1974 SHEET 3 IF 9 PATENTEU M26 i874 SHhEI 5 OF 9 PATENTEDMRZS 1914 3798328 SHEET a {If 9 PAIENTED was 1974 slrsalsze SHEET 9 BF 9 \R Sm Q5 SINKER FOR WARP KNITTING MACHINE This invention relates generally to warp knitting machines, and more specifically to the sinkers utilized in such machines.

In the sinkers previously known in the art, the throats thereof are defined as a U-shaped opening, the termination of the .U serving as the effective stop for movement of the stitches during the knitting cycle. This prior art configuration leads to certain consequences. On the one hand the thread ends which run between the wales even after knock-over, are greatly affected during the upward movement of the needles by contact with the terminal step of the said opening. Furthermore, because the needle shafts become thicker toward the base ends thereof, the space between the shafts and the sinker plates is comparatively small, so that only thread material of rather narrow guage can be worked without interference.

The affect upon the threads running between the wales at the throat terminal end of the aforementioned sinkers, may be lessened to a certain extent by moving the sinkers slightly backward during the upward thrust of the needles. However, during this additional movement, waste of drive power of the warp knitting machine is increased. It is also known to use sinkers for warp knitting machines which have no terminal throat step, but serve merely to hold down the beginning of the goods. Unfortunately, using machines which are equipped with sinkers of this type, only a comparatively inexact stitch pattern can be produced, since the old stitches are not sufficiently supported at the knockover point.

The foregoing disadvantages of the known sinkers are avoided, in accordance with the present invention, by means of a construction wherein a protruberence formed in the lower portion of the sinker throat functions as a knock-over stop (in analogy to the similar function formed by the terminal end of the throats of the prior art), and by extending the throat beyond the angularly by a slot. This lengthening of the sinker throat permits the old stitches to slide off and expand into the said slot after the knock-over, during the subsequent upward thrust of the needles which occurs during development of the new stitches.

The new stitches are thus free to move sideways in the realm of the lengthened throat, so that the friction on the needle shafts is reduced and at the same time thicker thread material may be utilized.

The invention is diagramatically illustrated by way of example, in the drawings appended hereto, in which:

FIG. 1 is a plan view of a sinker in accordance with the present invention having a step-formed angularity formed at'the bottom portion of the throat thereof; and

FIG. 2 is a plan view of a further sinker in accordance with the present invention, having a nose-formed angu- 1 In the embodiment of the invention seen in FIG. 1,-

a protruberence is formed at the lower edge of the sinker throat. The angularity is more specifically defined by step 7. Adjacent to the angularity 6, the throat 4 is extended by a slot 10 extending into the upper part of the throat.

In the embodiment of FIG. 2 the protruberence 6 comprises a nose 8. Beyond such protruberence the throat is again extended by a slot 100. The dotted line 9 illustrates the maximum backward position of a needle (not illustrated), which demonstrates how the threads can expand into the enlarged throat at slots 10 or 10a.

While the present invention has been set forth in terms of specific embodiments thereof, it will be understood in view of the instant teaching, that numerous variations are now enabled to those skilled in the art, which variations yet reside within the scope of the present teaching. Accordingly the invention is to be broadly construed, and limited only by the scope and spirit of the Claims-now appended hereto.

I claim:

1. A sinker for a warp knitting machine having a protruberence angle in the bottom portion of the throat thereof, said protruberence functioning as a knockover stop during the knitting cycle, and a slot portion formed at said throat beyond said protruberence, for enabling expansion of stitches beyond said protruberence after said knock-over.

2. A sinker in accordance with claim 1 wherein a nose protrudes from the throat formed of said slot.

3. A sinker in accordance with claim 1, wherein said protruberence comprises a step formed at said throat portion. I

4. A sinker in accordance with claim 1, wherein said protruberence comprises a nose-like portion.

UNITED STATES PATENT OFFICE CERTIFICATE OF CGRRECTION Patent No. 3,798,928 Dated March 25, 1974 Inventor(s) L KOHL It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

In the first sheet of drawing, "Sheet 1 of 9" should read Sheet 1 of 1 Cancel sheets 2-9 Signed and sealed this 13th day of August 1974.

(SEAL) Attest:

MCCOY M. GIBSON, JR. C. MARSHALL DANN Attesting Officer Commissioner of Patents 

1. A sinker for a warp knitting machine having a protruberence angle in the bottom portion of the throat thereof, said protruberence functioning as a knock-over stop during the knitting cycle, and a slot portion formed at said throat beyond said protruberence, for enabling expansion of stitches beyond said protruberence after said knock-over.
 2. A sinker in accordance with claim 1 wherein a nose protrudes from the throat formed of said slot.
 3. A sinker in accordance with claim 1, wherein said protruberence comprises a step formed at said throat portion.
 4. A sinker in accordance with claim 1, wherein said protruberence comprises a nose-like portion. 